| 摘要 |
PCT No. PCT/SE91/00270 Sec. 371 Date Jan. 11, 1993 Sec. 102(e) Date Jan. 11, 1993 PCT Filed Apr. 17, 1991 PCT Pub. No. WO91/18491 PCT Pub. Date Nov. 28, 1991.Process for the production of a multilayer printed circuit board composed of a plurality of so-called inner layers, each consisting of an insulating base of thin laminate of reinforcement material impregnated with thermosetting resin. The laminate is preferably provided with a layer of metal or metal alloy on both sides, in which layers a wiring pattern has been formed. Prepreg sheets of reinforcement material impregnated with thermosetting resin are placed between the inner layers. The resin is not fully cured. The inner layers are centered in respect of each other and fixed in this position by pressing the different sheets together along the long sides. Energy is then supplied within a limited area along the two long sides. Thereby the resin is heated and cured so that all sheets are bonded together with each other, preferably in a few spots or minor areas. The package obtained is then laminated under heat and pressure together with conventional outer layers and/or foils of metal or metal alloy to a multilayer printed circuit board which is then completed in the usual way. |
